39 lines
1.1 KiB
Diff
39 lines
1.1 KiB
Diff
Subject: Still use ACPI backlight control if _DOS doesn't exist
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This is a regression introduced by commit
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ea9f8856bd6d4ed45885b06a338f7362cd6c60e5
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https://bugzilla.kernel.org/show_bug.cgi?id=43168
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Some platforms don't have _DOS control method, but the ACPI
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backlight still works.
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We do not want to lose the backlight control ability on these platforms.
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CC : Igor Murzov <intergalactic.anonymous@gmail.com>
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Signed-off-by: Zhang Rui <rui.zhang@intel.com>
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---
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drivers/acpi/video.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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Index: rtd3/drivers/acpi/video.c
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===================================================================
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--- rtd3.orig/drivers/acpi/video.c
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+++ rtd3/drivers/acpi/video.c
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@@ -565,8 +565,14 @@ acpi_video_bus_DOS(struct acpi_video_bus
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video->dos_setting = arg0.integer.value;
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status = acpi_evaluate_object(video->device->handle, "_DOS",
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&args, NULL);
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- if (ACPI_FAILURE(status))
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- return -EIO;
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+ if (ACPI_FAILURE(status)) {
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+ /*
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+ * some platforms don't have _DOS, but the ACPI
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+ * backlight control still works
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+ */
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+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _DOS\n"));
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+ return 0;
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+ }
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return 0;
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}
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